Editing Openai/694590c5-f52c-800f-9af6-d10143a2d812 (section)

=== Assistant: Because reducers match on the exact action type string. ===
Because reducers match on the exact action <code>type</code> string. Two different things can make the same type show up:
# Importing the same action creator into another slice and registering it there:

<syntaxhighlight lang="ts">// authSlice.ts
export const userLoggedOut = createAction('auth/userLoggedOut')

// postsSlice.ts
import { userLoggedOut } from '@/features/auth/authSlice'

extraReducers: builder => {
  builder.addCase(userLoggedOut, () => initialPostsState) // runs when auth/userLoggedOut is dispatched
}

</syntaxhighlight>

Here postsSlice handles auth/userLoggedOut because it explicitly registered that exact action (via the imported userLoggedOut).
# Using a different action creator/string (e.g. 'posts/userLoggedOut') will not run for 'auth/userLoggedOut':

<syntaxhighlight lang="ts">// postsSlice.ts
builder.addCase('posts/userLoggedOut', () => { /'' won't run for auth/userLoggedOut ''/ })

</syntaxhighlight>

So: if you see postsSlice reacting to logout, it’s because the slice code registered a handler for the same action type (auth/userLoggedOut) — usually by importing the userLoggedOut action creator from the auth slice. If it registered posts/userLoggedOut instead, that handler would never run when you dispatch(userLoggedOut()).